You should consider using services like Mailchimp or ConvertKit for building your email list. You can easily create opt-in forms and automate your email campaigns. These platforms provide valuable tools for growing and managing your list. You can also use services like GetResponse or AWeber to build your list with their drag-and-drop email builder. You should choose a service that integrates well with your website and social media. You can also try Leadpages for creating high-converting landing pages. Make sure to select a service that fits your needs and budget. Always focus on building an engaged and quality list.